A competitive NBA playoff game on TNT that went into overtime, Miami vs. Boston, took a toll on the broadcast networks last night, with most series down from last week. The disintegration of CBS’ once-formidable Monday lineup continues. How I Met Your Mother(2.5/8) was down 11% from last week to tie its series low. Mad Love (1.8/5) was down 18% for a series low,Mike & Molly (2.2/5) andHawaii Five-0 (2.3/6) were both down 8%. Both Mike & Molly and Hawaii Five-0 also hit new series lows for a second consecutive week. Once a demo leader on Mondays, CBS (2.1/6, 7.3 million) finished third behind ABC (3.8/10, 17.7 million) and Fox (2.3/6, 6.7 million).

ABC’s Dancing With the Stars (4.1/11) was down 9% from last week, whileCastle(3.1/8) was up 7%. Castle was joined in the plus ratings column by Fox’sThe Chicago Code (1.7/4, up 6%). Its lead-in, freshly renewed House (2.9/9) was flat, tying last week’s season low.

NBC’s bubble shows Chuck (1.3/4) and Law & Order: LA (1.2/3) didn’t boost their chances to come back with last night’s ratings performances, down 7% and 14%, respectively, and Chuck tying its series low. The Event (1.1/3), which is beyond the bubble and into graveyard territory, was down 15% and tied as series low.